port forwarding

Hi,

I have here a complicated setup for port forwarding. I want to forward a 
port of a oracle database. Three computers are involved:

w: windows machine with oracle installed
r: remote, linux. Here I want to run some oracle tools
l: local, linux. A Box between those two

I want to access the database on w from r. There is no direct connection 
between w and r. I only have a ssh tunnel from r to l.
To establish the connection, I startet a ssh connection to r on l and 
forward port 11523 on r to port 1521 on w:

ssh -v r -R 11523:w:1521 -g -N

Trying to use the oracle tools on r, I cannot get the connection to w.
But it should work. :-)

Accessing the oracle port on w from l directly works without problems. 
So there must be something wrong with the tunnel.

Any ideas what I am doing wrong?

kind regards,
Rainer